Q: I want to install an irrigation system at my house. Do I want to have the water source before or after the water softener?
A: Most water softeners use potassium chloride or sodium chloride to soften the water. If you water your plants with this water it can cause a build up of salt in the soil known as sodic soil.
This is not good for you plants and should be avoided. The best bet is to have a plumber tap into the water line before the water reaches the water softener and use that as the water source for your irrigation.